ROYD-013 "If you can hold out for a week without cumming, I'll let you fuck me!" My little devil of a sister keeps teasing my dick. Mizuki Harusumi

The stepsister from my parents' remarriage is a super slutty little devil high school girl! The unpopular virgin masturbator stepbrother was offered a devil's contract: 'If you can hold out for a week without ejaculating, I'll let you have sex with me! But if you cum, you'll be my slave forever.' Since then, the stepsister has been relentlessly targeting his dick with handjobs, blowjobs, and even dry humping. The stepbrother somehow endured it all, but the moment time ran out, he immediately inserted his dick into her vagina from behind! Overwhelmed by the unexpectedly huge dick, the stepsister fell into pleasure and ended up becoming his obedient sex slave. What a dramatic reversal!